First, it installed and opened without any trouble. I had to force a shutdown because of an unrelated issue, and when I turned it back on and opened the app, it froze on the splashscreen and crashed. It ended up being a duplicate Palatino, so I removed it, reinstalled, and it worked correctly. Later on, it froze (my computer is freezing a lot lately), so I clicked on Force Quit. Opening it made it crash like before, so I reinstalled it, but it froze mid-wizard. Force Quit again, and now there's no way I can get it to work. I checked fonts with the Font Book validation; nothing is wrong. Deleted the .fonts folder, cleared the font cache, deleted the metadata.db and the .calibre_calibre GUI.lock files, uninstalled the app using CleanMyMac's 'complete' uninstaller, everything. I have done both of those processes twice. Each time, reinstalling, passing the wizard and opening the application makes it crash just like before.

I will as soon as I get my MacBook back on track (it won't even get past the login screen now). Thanks!
(And by the way, sorry dwanthny, I tried [hide] and it didn't work, so I assumed the code wasn't supported)